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(No Model.)

J. B. POLLOGK.

VENTILATING APPARA'L'US POB, WHITE 4LEAD STCKS. No. 247,105. Patented Sept. 13,1881.

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WITNESSBS INVBNTOR BY A ATTORNEYS.

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UNITED STATES PATENT OFFICE.

JAMES B. POLLOOK, OF PORT RICHMOND, NEW YORK.

VENTILATING APPARATUS FOR WHITE-LEAD STACKS.

SPECIFICATION forming part of Letters Patent No. 247,105, dated September 13, 1881.

Application led June 23, 1881. (No model.)

To all lwhom it may concern:

Be it known that I, JAMEs B. PoLLooK, of Port Richmond, Richmond county, New York, have invented a new and Improved Ventilatin gAppar-atus for WVhite-Lead Stacks, of which the following is a specification.

The drawing represents a vertical sectional elevation of rnyimproved lead-corroding stack or bed.

In the drawing, A represents the corroding bed or stack; B, the spent tan-bark or other. material used in quickening the action of the corroding medium.

O C represent the earthen pots, set in tiers upon the tan-bark B, and provided with ventilating-holes a in their sides, and with internal projections, b, for the buckles of lead lto rest upon; and D represents the board coverings ofthe said pots O O.

E E represent leaden buckles in the pots O C, and F represents the-acetic acid or other corroding-liquid in the bottom ot' pots O C.

G represents the central Ventilating-flue, formed vertically in the bed or stack A; and H is the tine-lining, preferably constructed ot' boards, and made in sections, each of which extends from the covering D ot'one tier ot' pots, O O, to the bottom of the next tier above, excepting the upper section, whose top extends above the surrounding tan-bark B B. By this lining H it will be seen that the tan-bark B is prevented from falling into the flue G. At as many points as are desirable a collar, I, that serves as avalve-seat, is secured in the lining H. K is the valve-rod, having secured upon it, at

suitable distances apart, as many valves M as are required, the inner valve M being relatively small, to fit upon and cover the openings in the valve-seats 1,while the upper valve M is large enough to cover the top ot' the lining H.

It will be seen that by moving the rod and valves K M upward the ventilation may be made sufficiently free, while by movingk them down the ventilation may be altogether checked or diminished at will, and in this respect this improved stack or bed has a great advantage over all others.

I do not confine myself to this precise construction of nue-lining, for, instead of being constructed in sections, as shown, it may be continuous, and provided with perforations at each tier of corroding-pots, and the said fluelining may be made' tapering, if desired.

Having thus described myinvention, Iclaim as new and desire to secure by Letters Patentln a white-lead corroding stack or bed, the combination, with the tiers O and boards D, ofthe boards H,lining the central Ventilatinglue, G, which are made in sections, extending from the boards D of one tier to the bottom of the next tier above, and provided with a large outer valve and smaller inner valve, M, substantially as shown, and for the purpose described.

JAMES BENJAMIN POLLOOK.

Witnesses:

JAMES WADE, GEO. H. RoBERTs. 

